Cyclic-amine-comprising absorption medium for removing acid gases

US8603226B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Hugo Rafael Garcia Andarcia · Mannheim, DE
• Ute Lichtfers · Karlsruhe, DE
• Georg Sieder · Bad Dürkheim, DE
• Oliver Spuhl · Mannheim, DE
• Steven Brughmans · Mannheim, DE

Key dates

• Filing date: Feb 2, 2010
• Grant date: Dec 10, 2013
• Expiry date: Mar 7, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An absorption medium for removing acid gases from a fluid stream comprises an aqueous solution of A) at least one cyclic amine compound having solely tertiary amine groups and/or sterically hindered secondary amine groups and B) at least one cyclic amine compound having at least one sterically unhindered secondary amine group. The absorption medium comprises, e.g., an aqueous solution of A) 1-hydroxyethylpiperidine and/or triethylenediamine and B) piperazine. The absorption medium is particularly suitable for separating off carbon dioxide from flue gases and satisfies the following criteria: (i) sufficient capacity at low CO2 partial pressures; (ii) sufficiently rapid absorption rate at low CO2 partial pressures; (iii) stability toward oxygen; (iv) low vapor pressure for reducing solvent losses; and (v) low energy requirement for regeneration of the absorption medium.